Process of dyeing rayon



Patented June 13, 1933 UN! STATES PATENT OFFICE BERKELEY L. HA'IHORNE,OF NEW YORK, N. Y., ASSIGNOB TO TUBIZE OKATILIiON CORPORATION, ACORPORATION OF DELAWARE PROCESS OF DYEING RAYON No Drawing.

This invention relates to a process of dyeing rayon in filament orfabric form with oil-soluble dyes and colors, and more particularly tothe dyeing of delusterized rayon filaments or fabrics.

In the various processes of preparing rayon it has been found that thereis incorporated throughout the filaments formed an oil, fat or wax, andthis is especially true in many delustered rayon fibers.

This process is of particular value to the dyeing of delustered rayon bymeans of the so-called oil-soluble dyes or colors, and it is proposed todye the globules of oils, fats or waxes in the rayon and leave the rayonfiber either undyed or only moderately stained. A few of the so-calledoil-soluble colors will dye ordinary rayons and other cellulose fibers,and the present invention includes these colors.

- Due to inherent manufacturing difficulties encountered in thepreparation of rayon filaments, there is considerable difl'erence fromskein to skein, and while it is not at present known whether thesedifferences in the filaments are physical or chemical, the resultantfabrics woven from these filaments are quite difficult to dye with anydegree of uniformity or level. Such ra on fabrics at present, afterdyeing, exhibit ark and light strands, which, of course, detracts fromtheir ap earance.

. undamentally, the present process contem lates the placing of theso-called oilsolu le dyes or colors in an aqueous solution in such amanner that the dyes or colors will uniformly stain the rayon to thecorrect depth or level, and in carrying out the proc ess the minuteglobules or oils, fats or waxes in the rayon are dyed, while thecellulose fiber is either left entirely undyed or only moderatelystained.

In carrying out the process, a novel boiling bath is utilized in whichthe oil-soluble dyes are intimately associated.

The following is a specific example of a dye bath which has been mostsuccessfully used in dyeing delustered rayon:

2 grams of benzol or other organic solvent are added to 10 grams ofsulfonated castor Application filed June 3, 1829. Serial No. 368,187.

oil or other soap stock. A gram of an suitable oil-solub e dye or coloris then ad ed to the above and thoroughly mixed. A boiling solutionconsisting of 5 rams of soap and 25 rams of water, or in all 30 grams ofsolut1on, is added to the color solution and thoroughly agitated, afterwhich 2 liters of water containing 5 grams of soap kept at a boilingtemperature are added to the initial boiling solution. By the term rayonI intend to include acetate cellulose.

The boiling bath so formed is placed in a suitable vat in which isimmersed 100 grams of rayon filaments or fabrics. The rayon is treatedfor a period of approximately thirty minutes, during which time the bathis maintained at a. temperature of approximately 200 F., after which itis removed from the bath and washed and dried in the well-known manner.Preferabl though not necessarily, the combined boil ing and dyeing bathis agitated or stirred during the period of treatment.

Thus it will be seen that a stable boiling and dyeing bath is producedin which the oil-soluble color is intimate] dissolved and one in whichnormal dyestu s which are not oil-soluble may be advantageously used.Furthermore, it is ossible with this process to dye delusterized rayonand another cellulose fiber simultaneously in the same bath, using theoil-soluble colors, or a combination of oil-soluble colors and ordinarydyestuffs, so that the different fibers are cross dyed or two-tonedeffects are produced.

Rayon filaments or fabrics dyed in accordance with this process have auniform depth or level of color as there is a perfect combining of thedyestufl's with the minute globules of oils, fats or waxes, which areuniformly distributed throughout the fiber,

while the fiber itself remains undyed or only moderately stained.

What is claimed is:

1. As a new article of manufacture, a rayon filament in which onl theoils, fats and waxes contained therein ave been dyed with oil-solublecolors. 7 v

2. The process of dyeing the oily constituents of delustercd rayon whichconsists in immersing said rayon in a boiling bath containingoil-soluble colors.

3. The process of dyeing the oil constituents of delustered rayon whichconsists in 5 immersing said rayon for a period of approximately thirtyminutes in a boiling bath containing oil-soluble colors.

4. The rocess of dyeing the oily constituents of elustered rayon whichconsists in immersing said rayon in a boiling, bath containingoil-soluble colors, said ath being maintained at a temperature ofapproximatel 200 F.

he rocess of reparing a rayon dye 15 bath for yeing the oilyconstituents of rayon which consists in dissolving an oil-soluble colorin an organic solvent and soap mixture, adding an aqueous soap solutionthereto agitating the two mixtures together arid suhsequently adding asecond heated dilute soap solution thereto and agitating the combinedmixtures.

6. The process of im arting color to rayon which consists in yeing onlythe oils, 25 fats and waxes contained therein.

In testimony whereof I afiix my signature.

BERKELEY L. HATHORNE.

commons 0F CORRECTION.

Patent No. 1,913,987, June is. 1933.

BERKELEY L. HATHORNE.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 1,line 39, for "or" firstoccurrence read "of"; and lines 60 and 61, strikeout the words "By the term rayon I intend to include acetate cellulose."and insert the same after "stained." in line 93; and that the saidLetters Patent should be read with these corrections therein that thesame may conform to the record of the case in the Patent Office.

Signed and sealed this 15th day of August; A. 1). 1933;

(Seal) y Acting Commissioner of Patents.

immersing said rayon in a boiling bath containing oil-soluble colors.

3. The process of dyeing the oil constituents of delustered rayon whichconsists in 5 immersing said rayon for a period of approximately thirtyminutes in a boiling bath containing oil-soluble colors.

4. The rocess of dyeing the oily constituents of elustered rayon whichconsists in immersing said rayon in a boiling, bath containingoil-soluble colors, said ath being maintained at a temperature ofapproximatel 200 F.

he rocess of reparing a rayon dye 15 bath for yeing the oilyconstituents of rayon which consists in dissolving an oil-soluble colorin an organic solvent and soap mixture, adding an aqueous soap solutionthereto agitating the two mixtures together arid suhsequently adding asecond heated dilute soap solution thereto and agitating the combinedmixtures.

6. The process of im arting color to rayon which consists in yeing onlythe oils, 25 fats and waxes contained therein.

In testimony whereof I afiix my signature.

BERKELEY L. HATHORNE.

commons 0F CORRECTION.

Patent No. 1,913,987, June is. 1933.

BERKELEY L. HATHORNE.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 1,line 39, for "or" firstoccurrence read "of"; and lines 60 and 61, strikeout the words "By the term rayon I intend to include acetate cellulose."and insert the same after "stained." in line 93; and that the saidLetters Patent should be read with these corrections therein that thesame may conform to the record of the case in the Patent Office.

Signed and sealed this 15th day of August; A. 1). 1933;

(Seal) y Acting Commissioner of Patents.

